From: Luiz Augusto von Dentz <[email protected]>
This introduces strisutf8 which can be used to verify if a string is
encoded using UTF-8 format.
---
src/shared/util.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++
src/shared/util.h | 3 +++
2 files changed, 65 insertions(+)
diff --git a/src/shared/util.c b/src/shared/util.c
index 4d1c0d00545d..e9c1c18f5ea7 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -1705,3 +1705,65 @@ int strsuffix(const char *str, const char *suffix)
return strncmp(str + len - suffix_len, suffix, suffix_len);
}
+
+char *strstrip(char *str)
+{
+ size_t size;
+ char *end;
+
+ if (!str)
+ return NULL;
+
+ size = strlen(str);
+ if (!size)
+ return str;
+
+ end = str + size - 1;
+ while (end >= str && isspace(*end))
+ end--;
+ *(end + 1) = '\0';
+
+ while (*str && isspace(*str))
+ str++;
+
+ return str;
+}
+
+bool strisutf8(const char *str, size_t len)
+{
+ size_t i = 0;
+
+ while (i < len) {
+ unsigned char c = str[i];
+ size_t size = 0;
+
+ /* Check the first byte to determine the number of bytes in the
+ * UTF-8 character.
+ */
+ if ((c & 0x80) == 0x00)
+ size = 1;
+ else if ((c & 0xE0) == 0xC0)
+ size = 2;
+ else if ((c & 0xF0) == 0xE0)
+ size = 3;
+ else if ((c & 0xF8) == 0xF0)
+ size = 4;
+ else
+ /* Invalid UTF-8 sequence */
+ return false;
+
+ /* Check the following bytes to ensure they have the correct
+ * format.
+ */
+ for (size_t j = 1; j < size; ++j) {
+ if (i + j > len || (str[i + j] & 0xC0) != 0x80)
+ /* Invalid UTF-8 sequence */
+ return false;
+ }
+
+ /* Move to the next character */
+ i += size;
+ }
+
+ return true;
+}
diff --git a/src/shared/util.h b/src/shared/util.h
index ce57b53be9ef..c37b0f7296ab 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -12,6 +12,7 @@
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
+#include <stdbool.h>
#include <alloca.h>
#include <byteswap.h>
#include <string.h>
@@ -88,6 +89,8 @@ do { \
char *strdelimit(char *str, char *del, char c);
int strsuffix(const char *str, const char *suffix);
+char *strstrip(char *str);
+bool strisutf8(const char *str, size_t length);
void *util_malloc(size_t size);
void *util_memdup(const void *src, size_t size);
--
2.40.1